Halogenated red vat-dye and process of making same.



UNITED STATES r I new.

GADIENT ENGI, oF'nAsEL, SWITZERLAND,

ASS IGNOR TO THE FIRM OF SOCIETY 0E CHEMICAL INDUSTRY IN BASLE, OIBASEL, S\\"ITZE-RLAND.

HALOGENATED RED VAT-DYE AND PROCESS OF MAKING SAME.

Specification of Letters Patent.

Patented Oct. 8, 1907.

Application filedMarch 23,1907. Serial No. 364,02

To all whom it may concern:

Be it known that I, GADIENT Error, doctor of philosophy and chemist, acitizen of the Swiss Republic,

- and a resident of Basel, Switzerland, have invented a new and usefulHalogenated Red Vat-Dyeing Dyestuff and a Process for the Manufacture ofthe Same, ofwhich the following is a full, clear, and exactspecification.

In theUnited States Letters Patent No. 831844 dated September th, 1906,I have described the manufacture of a red vat-dyeing dyestuff, byheating salicylthioacetic acid /SCH2,G0OH 1) a 4 r y i v in the presenceof. an aromatic nitro hydrocarbon.

Since I have found, that this dyestuff, which has the constitution of ath ioindigo corresponding to the forcan be transformed by its treatmentwith halogens or halogenating agents into new valuable halogenatedderivatives having a greater affinity to cotton and being faster towashing. The manufacture of these new halogenated derivatives of'thioindig'o is illustrated by the following example.

A mixtureof 5 parts ofthioindigo, parts of nitro-' benzene and I6 to 18parts oi-loromin is allowed to stand for about 24 hours in a refluxapparatus at the ordinary temperature and then heated in an oil bath forabout 3 hours in thesaidrefiux, apparatus, the temperature of the bathbeing to C. After cooling the mass is filtered and the solid matter iswashed with alcohol and dried. The dyestuff obtained in this mannerforms a gray-violet crystalline powder yielding by its l l I I l I 1 anda pale yellow fluorescence.

What I claimis:

1. The described process for the manufacture of ha1o- 0 genatedvat'dyeing dyestuffs, by treating thloindigo with a halogen, in presenceof an indifferent diluent.

2. The described process for the manufacture oi. a halo 55 genatedvat-dyeing dycstuff by treating thioindigo with bromin in presence ofnitrobenzene. I g

As new products the described halogenated vat-dyeing dyestulfs, whichcan be obtained by treating thioindigo' with a halogen in presence of anindilferent diluent.- (5G 4. As a new product, the herein describedbromoderiv; ative of thioindigo, which is obtainedby'treating'iliiggdigowith bromin in presence oTifitI-obenw, constituting in dry state agreyish violet crystalline powdel f'soli hle in concentrated sulfuricacid to a bluish green solution I i-bre d.

which a red-violet precipitate is separated0n-addition of berry redcoloration and yellow fluorescence and yielding by treatment withalkaline reducing agents a light-yellow 7% colored vat, from whichunmordanted cotton is dyed in b0rdeauxred shades. g In witness whereofI, have hereunto signed my name this 2 day of March 1997, in thepresence of two subscribing witnesses GADIENT ENGI'. Witnesses:

G120. Glrnono, AMAND BRAUN.

